בס"ד
I think I would be upset about the lack of good manners and education if someone is looking hungry at my wife. But I would not be envy towards him, I would be angry towards him.
Would you be angry with him if he was looking at another girl? (one of who you're even attracted to)
I have learned, that in business even in competitive situation you should act rational. Because today you are compititors and tomorrow you are doing things together in order to make more money. I.e. you put your money together with another person in order to buy things in greater amount and so cheaper the single piece. I think business is basically not emotion but numbers.
The thing is the definition of rationality. I think jealousy just like other emotions is a pre-warning, a sign of something, just like any other pain. Jealousy for your wife is one step of inter-realizing that this man endangers some factors that you've been satisfied about before he looked at your wife.
In a competition, you should act rational, that's true, but keeping jealousy out is not good. Thinking envolves emotions and thinking without them is impossible and outrageous. Once you compete with someone you're able to hurt his business or the progress of his business. Once he beats you (if he does so), you'd get jealous and try to get ever further than he did (if you're competetors). That's a sign of ealousy. I think business, like any other area, involves feelings and emotions and that these things are not seperateable from our very process of thinking.
And even if I loose because of competition I have to change things. If I sit in the bar and curse my competitors (Jewish or not), I make things not better and find no solution to my problems.
When you show him your lose you'd probably lose even more. If he's a friend (though competetor) of yours, that'd be fine to continue compete him or just get out of the race. I agree that cursing wouldn't help you get your business's status better though I don't think that "surrendering" would do anything positive.
So I think envy is a part of human nature, but irrational and we should controll it.
Impossible. It's ok to try and control emotions but it's not cool to underestimate them, ignore them, reject them and call them "stupid".